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Elecbee MPPT Solar Lithium Battery Charger Module 12V Input 4.2V 2A 300kHz with 2-Pin PH 2.0mm Connector

SKU: 1608411
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Key Features

MPPT Solar Charging Technology: Integrated maximum power point tracking helps improve photovoltaic energy utilization and charging efficiency under varying sunlight conditions.

Single Cell Lithium Battery Support: Designed for 3.7V lithium-ion batteries with precise 4.2V charge termination and stable charging management.

Intelligent Charging Control: Supports constant current and constant voltage charging with automatic recharge and deep discharge trickle recovery functions.

Embedded Solar Power Integration: Compatible with 12V solar panels, IoT sensor nodes, wireless monitoring devices, and embedded low-power electronics.

Flexible Industrial Applications: Suitable for solar-powered embedded systems, environmental monitoring, smart agriculture equipment, portable electronics, and battery-powered control devices.

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Specifications
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Wireless Capability
Bluetooth
Model
CN3791
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Description

CN3791 · MPPT SOLAR CHARGER · 6V / 9V / 12V VERSIONS

Match the Charger Version to Your Solar Panel

Select the dedicated 6V, 9V or 12V module for the corresponding nominal solar-panel voltage, then charge one 3.7V lithium cell with CN3791 MPPT control.

CN3791 MPPT solar charger modules in 6V, 9V and 12V versions
Important: 6V, 9V and 12V are separate sales versions. This module does not provide a user-selectable 6–12V input setting.

CORRECT VERSION SELECTION

Choose by Nominal Panel Voltage

Match the module version to the nominal voltage marked on the solar panel before connecting the system.

6V VersionDC 6V input
For a nominal 6V panel
Product code: 010333
9V VersionDC 9V input
For a nominal 9V panel
Product code: 010334
12V VersionDC 12V input
For a nominal 12V panel
Product code: 010335

MPPT CONTROL

Track the Panel's Available Power

The CN3791 controller automatically follows the solar panel's maximum power point as available output changes, then manages charging for one 3.7V lithium cell.

Solar Output ChangesLight conditions vary
→
MPPT TrackingFollows available power
→
Managed ChargingFor one 3.7V cell
Front view of CN3791 MPPT solar lithium battery charger module

SINGLE-CELL CHARGING

Charge One 3.7V Lithium Cell

Constant-current and constant-voltage charging is specified with a 4.2V ±1% constant-voltage level. Charging current is set through an external resistor and supports up to 2A.

2A MaximumThe actual charging current depends on available solar power, current setting, battery state and thermal conditions.
4.2V ±1%Specified constant-voltage charging level for one 3.7V lithium cell.
300kHz PWMSpecified switching frequency for the charging controller.

CHARGE MANAGEMENT

Support Across the Charging Cycle

The module includes trickle charging for a deeply discharged cell, automatic recharge, soft start, charging and charge-complete status indication, and battery-terminal overvoltage protection.

1. Deeply Discharged CellTrickle-charging support
2. Normal ChargingConstant-current / constant-voltage process
3. Recharge ConditionAutomatic charging restart support
Exact trickle-current values, recharge thresholds, timing data and status-indicator colors are not specified.

PARALLEL PH2.0 PORTS

Multiple Connection Points for Cleaner Wiring

Three interconnected 2-pin ports are provided on the SOLAR IN side, and three interconnected 2-pin ports are provided on the BAT/GND side.

CN3791 MPPT solar charger specifications and solar battery port diagram
SOLAR IN SideVIN is the positive solar-panel input; GND is the negative connection.
BAT / GND SideBAT is the positive battery node; GND is negative. A compatible 3.7V load connects in parallel with the battery.

The BAT connection is a shared battery/load node, not a confirmed separate regulated load output.

CONFIRMED SPECIFICATIONS

Product Data

Product Type MPPT solar lithium-battery charger module
Charging IC CN3791
PCB Version CN3791 MPPT Solar Charger V1.0
Sales Versions Dedicated DC 6V, DC 9V and DC 12V versions
Battery One 3.7V lithium cell
Maximum Charging Current 2A maximum
Constant-Voltage Level 4.2V ±1%
Charging-Current Setting External resistor
PWM Switching Frequency 300kHz
Connector Type PH2.0-2P
Module Dimensions 45 × 20 × 9.5mm
Specified Operating Temperature −40°C to +85°C

APPLICATION SCENARIOS

For Compatible Solar-Powered Projects

Solar Electronics PrototypesBuild a single-cell solar charging system with the matching module and panel voltage.
Outdoor Sensor NodesUse in a suitable protective enclosure for compatible sensing and monitoring projects.
Portable 3.7V ElectronicsEvaluate for compatible devices powered by one 3.7V lithium cell.
MPPT DevelopmentObserve solar-input changes and evaluate the CN3791 tracking function in a prototype.

CONNECTION GUIDE

Check Every Connection Before Power-Up

1. Select the Module VersionMatch the 6V, 9V or 12V module to the solar panel's nominal voltage.
2. Connect the Solar PanelConnect panel positive to VIN and panel negative to GND at SOLAR IN.
3. Connect the BatteryConnect one 3.7V lithium cell to BAT and GND with correct polarity.
4. Connect a Compatible LoadConnect the 3.7V load in parallel with the battery at BAT and GND.
Wiring SafetyDisconnect the solar input before changing wiring. Confirm version, polarity, battery connection and load compatibility before power-up.

PACKAGE CONTENTS

Module and PH2.0 Cables Included

CN3791 MPPT solar charger module with two PH2.0 cables
Included

1 × corresponding CN3791 MPPT charger module
2 × PH2.0 cables

Solar panel, lithium battery, load, enclosure, mounting hardware and additional protection board are not included.

IMPORTANT LIMITATIONS

Design the Complete System Safely

Battery-terminal overvoltage protection is specified. Battery overdischarge protection, short-circuit protection, output overcurrent protection, reverse-polarity protection, battery-temperature monitoring and solar-input surge protection are not confirmed.

The operating-temperature specification does not indicate waterproofing or weather resistance. Outdoor use requires a suitable enclosure and system-level protection.

Shopping Guide
Shipping
Delivery Period
Elecbee ships orders once a day at about 5pm except Sunday.
Once shipped, estimated delivery time depends on the below carriers you chose.
Express: 3-7 days.
Standard Post: 7-20 days.
Shipping RatesShipping rates for your order can be found in the shopping cart.
Shipping OptionsWe offer express and standard delivery services.
Shipping TrackingWe will notify you by email with tracking number once order is shipped. You can track your order using the “Track My Order” feature.
Returning/WarrantyReturningReturns are normally accepted when completed within 30 days from date of shipment, please contact customer service for a return authorization. Parts should be unused and in original packaging. Customer has to take charge for the shipping
WarrantyAll Elecbee purchases come with a 30-day money-back return policy, plus 1-year Elecbee warranty against any manufacturing defects.
This warranty shall not apply to any item where defects have been caused by improper customer assembly failure by customer to follow instructions, product modification, negligent or improper operation
OrderingHow to BuyElecbee accepts online orders.
Add to cart > Check out > Submit order > Complete payment > Delivery
PaymentPayPal, Credit Card includes Visa, Master, American Express, Bank transfer.
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In-Stock
Qty.
1
Unit Price
$ 2.99
Ext. Price
$ 2.99
$ 2.99
Qty.
Unit Price
Ext. Price
10+
$2.84
$ 28.40
100+
$2.54
$ 254.00
Inquiry for more quantity?